I had something very suspicious happen on my BTC-E account (lost all my BTC).

When I login to BTC-E, I will get a "Successful authorization" notice via email with the IP address of login. The last time I logged into BTC-E was in the beginning of August. However, recently I was unable to login to my account (email was no longer valid) and I was able to recover access via BTC-E support by providing them proof of deposits.

When I finally opened my account today, I saw that all my coins had been transferred to this wallet address through an unrecognized transaction I did not authorize in September: 18nCqz6GV4HhcagwVnEF6X9Ha6A3YbGEPT.

However, when I check my email, I do not see any "Successful Authorization" in September or any other confirmed logins after my last known login in August.

If someone hacked my account, wouldn't they have to at least login the first time where I would have been notified? Is there a way for this to happen otherwise? I am somewhat suspicious that this may have been done internally.

I had something very suspicious happen on my BTC-E account (lost all my BTC).

When I login to BTC-E, I will get a "Successful authorization" notice via email with the IP address of login. The last time I logged into BTC-E was in the beginning of August. However, recently I was unable to login to my account (email was no longer valid) and I was able to recover access via BTC-E support by providing them proof of deposits.

When I finally opened my account today, I saw that all my coins had been transferred to this wallet address through an unrecognized transaction I did not authorize in September: 18nCqz6GV4HhcagwVnEF6X9Ha6A3YbGEPT.

However, when I check my email, I do not see any "Successful Authorization" in September or any other confirmed logins after my last known login in August.

If someone hacked my account, wouldn't they have to at least login the first time where I would have been notified? Is there a way for this to happen otherwise? I am somewhat suspicious that this may have been done internally.

No one in here can see your settings, or what really happened on your BTC-e possible hack. You can report it in scam thread and see if anyone there is able to follow BTC to a known scamme. But that does not help you get your coins back.

Likely all you can do is ask BTC-e support which I have heard can be slow at times. But you will need to ask them for help on what happened, but it's likely coins are gone no matter what they find.

and did u enable 2FA ? From their TOS "Claims about third party fraudulent activities on accounts with disabled 2FA will not be taken into consideration. "

Considering 2FA make this improbable to happen at all short of getting your 2FA device stolen as well, i don't really see OP as some kind of expection. Pretty sure his BTC is gone if it was indeed moved out of his account.